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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Each session is identified by a random 8-byte session identifier.
*
* For efficiency, the session id is only transmitted over the control
* channel (which only sees traffic occasionally when keys are being
* negotiated).
*/
#ifdef ENABLE_CRYPTO
#ifndef SESSION_ID_H
#define SESSION_ID_H
#include "basic.h"
#include "buffer.h"
struct session_id
{
uint8_t id[8];
};
extern const struct session_id x_session_id_zero;
#define SID_SIZE (sizeof(x_session_id_zero.id))
static inline bool
session_id_equal(const struct session_id *sid1,
const struct session_id *sid2)
{
return !memcmp(sid1->id, sid2->id, SID_SIZE);
}
static inline bool
session_id_defined(const struct session_id *sid1)
{
return memcmp(sid1->id, &x_session_id_zero.id, SID_SIZE) != 0;
}
static inline bool
session_id_read(struct session_id *sid, struct buffer *buf)
{
return buf_read(buf, sid->id, SID_SIZE);
}
static inline bool
session_id_write_prepend(const struct session_id *sid, struct buffer *buf)
{
return buf_write_prepend(buf, sid->id, SID_SIZE);
}
static inline bool
session_id_write(const struct session_id *sid, struct buffer *buf)
{
return buf_write(buf, sid->id, SID_SIZE);
}
void session_id_random(struct session_id *sid);
const char *session_id_print(const struct session_id *sid, struct gc_arena *gc);
#endif /* SESSION_ID_H */
#endif /* ENABLE_CRYPTO */
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